Lake Superior and Climate Change
 Last summer, the National Park Service issued a little-noticed bulletin with this tidbit. The northern Midwest, including the upper Great Lake region, has warmed by almost 4 degrees Fahrenheit in the 20th century. Data for Lake Michigan, Huron and Superior show that summer water temperatures are increasing. Lake Superior’s summer surface water temperatures have increased by 4.5 degrees Fahrenheit since since 1980. This week top resource scientists gathered in Duluth to add a few …